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Dynamic wetting with viscous Newtonian and non-Newtonian fluids
1Department of Physics, Carnegie Mellon University, USA. Center for Complex Fluids Engineering, Carnegie Mellon University, USA.
Summary
This study reveals how fluid properties influence dynamic wetting. Newtonian polymer melts follow hydrodynamic models, while shear thinning significantly impacts wetting, unlike fluid elasticity.
Area of Science:
- Fluid dynamics
- Materials science
- Rheology
Background:
- Dynamic wetting is crucial in various industrial processes.
- Understanding fluid behavior near the contact line is key.
- Classic models often simplify the complex physics of wetting.
Purpose of the Study:
- To investigate dynamic wetting phenomena in Newtonian and non-Newtonian fluids.
- To analyze the influence of wedge flow near the contact line on wetting.
- To determine the impact of shear thinning and elasticity on dynamic wetting.
Main Methods:
- Experimental examination of dynamic wetting with viscous fluids.
- Utilizing hydrodynamic models to describe fluid behavior near the contact line.
- Comparative analysis of Newtonian polymer melts, Boger fluids, and other polymeric fluids.
Main Results:
- Newtonian polymer melts exhibit dynamic wetting consistent with hydrodynamic models.
- Shear thinning significantly affects dynamic wetting by reducing drag.
- Fluid elasticity shows a lesser impact on dynamic wetting compared to shear thinning.
- Some nominally Newtonian fluids deviate from predicted Newtonian wetting behavior.
Conclusions:
- Hydrodynamic models accurately describe dynamic wetting for certain Newtonian fluids.
- Shear thinning is a dominant factor influencing dynamic wetting in non-Newtonian fluids.
- Deviations from Newtonian behavior highlight the complexity of fluid dynamics in wetting processes.
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